WO2017195417A1 - Coal grinding device, device and method for controlling same, and coal-fired power plant - Google Patents

Abstract

This coal grinding device is provided with a table capable of rotating, a roller for grinding coal supplied from the table, a rotating classifier for classifying pulverized coal obtained by the grinding of the coal in the roller, and an air supply unit for generating an air flow that guides the pulverized coal to the rotating classifier. A device for controlling the coal grinding device is provided with: a first command value generator for generating a command value for a first parameter including at least one parameter among the rotational speed of the table, the pressing force of the roller on the table, and the air supply quantity in the air supply unit; and a second command value generator for generating a command value for a second parameter including at least the rotational speed of the rotating classifier. The first and second command value generators are configured so as to determine the command values for the first and second parameters on the basis of at least first and second preceding signals determined according to load information of a burning device that burns the pulverized coal from the coal grinding device.

Description

Coal grinding device, control device and control method therefor, and coal-fired thermal power plant

The present disclosure relates to a coal crushing apparatus for crushing coal, a control device and control method therefor, and a coal-fired power plant.

For example, in a coal-fired thermal power plant, steam is generated by heat exchange with a combustion gas generated by burning pulverized coal pulverized by a coal pulverizer in a furnace, and power generation is performed by driving a turbine using the steam. Is going.

Here, the load of the coal-fired thermal power plant is not always constant, and the coal-fired thermal power plant may be operated with a change in load. For example, when a coal-fired thermal power plant is connected to a power grid, it is desirable to quickly change the load on the coal-fired thermal power plant according to the request of the grid side for the purpose of stabilization of grid frequency etc. Be

However, in a coal-fired thermal power plant, even if the amount of coal (raw coal) supplied to the coal crusher is changed, there is a time lag (delay in coal output) until the amount of coal output from the coal crusher changes. Do. For this reason, it is difficult to quickly change the load on the coal-fired power plant.

In this respect, Patent Document 1 discloses that the rotational speed of the table is determined based on the coal feeding amount command value and the parameter relating to the change in the load of the generator in order to eliminate the delayed coal output. There is.

In Patent Document 2, the amount of coal feeding is increased or decreased according to the increase or decrease of the load of the vertical mill, and the rotation speed of the table is used to compensate for the excess or deficiency of the amount of coal output based on the time delay from coal feeding to There is disclosed a control method of a vertical mill which is adapted to increase or decrease the.

In Patent Document 3, a load correction signal is obtained based on the dynamic characteristics of the amount of coal output at the time of output command change when parameters such as coal moisture or hardness, primary air flow rate, and classifier rotation speed change, It is disclosed to control the amount of coal feeding and the classifier rotation speed based on the load correction signal.

In Patent Document 4, an output demand signal is input to a first-order lag operator, an output demand signal is subtracted from a signal obtained to generate a correction signal, and processing by a limiter and an integrator is added to the correction signal. A control method of a coal pulverizer is disclosed which generates a rotation number command of a rotary separator (rotational classifier) corresponding to a load state by adding a signal from a constant generator. Here, the constant generator is configured to set the rotation number of the rotary separator (rotational classifier) to a constant value.

Patent Document 5 includes a main operation circuit for calculating a command signal related to the amount of coal supply based on detection data from a boiler or a generator, and a standard amount of coal output pattern preset in the coal crushing apparatus. There is disclosed a control method of a coal crushing apparatus including: an additional control unit for calculating a deviation from a current amount pattern of coal output, and adding a calculation result by the additional control unit to a main arithmetic circuit as a correction signal. .

In Patent Document 6, at least one operation of the mill, the primary air conveyance unit, or the coal supply unit based on the amount of decarburization (the amount of coal removal) determined based on the driving state of the mill and the required output of the combustion furnace. A pulverized coal supply system adapted to determine the quantity is disclosed.

In Patent Document 7, even when the outlet temperature of the pulverized coal machine fluctuates due to the opening control of the transfer air flow rate adjustment damper at the time of load change, the amount of coal output according to the coal output command signal is calculated In order to secure, the output temperature correction signal is obtained based on the deviation between the detection value of the outlet temperature of the pulverized coal machine and the set temperature, and the output temperature correction signal is used to control the opening of the air flow control Is disclosed for use in

JP, 2015-100740, A Japanese Patent Application Laid-Open No. 63-62556 JP-A-8-243429 Unexamined-Japanese-Patent No. 4-334563 Unexamined-Japanese-Patent No. 2010-104939 JP, 2012-7811, A JP-A-4-93511

However, a larger load change rate is required for the coal-fired power plant, and the coal pulverizers described in Patent Documents 1 to 7 may not have a sufficient improvement effect on the delayed coal output.

SUMMARY OF THE INVENTION At least some embodiments of the present invention have been made in view of the above-mentioned problems, and a coal crushing apparatus and its control device and control method, and coal-fired thermal power plant capable of further improving the delayed coal output Intended to be provided.

(1) A control device for a coal crusher according to at least some embodiments of the present invention,
A table configured rotatably, a roller for grinding coal supplied from the table, a rotary classifier for classifying pulverized coal obtained by crushing the coal in the roller, the pulverized coal A control device for a coal comminution device, comprising: an air supply unit for generating an air flow for directing the rotary classifier to the rotary classifier.
A first command value generation unit for generating a command value of a first parameter including at least one of a rotation speed of the table, a pressing force of the roller against the table, or an air supply amount in the air supply unit; ,
A second command value generation unit for generating a command value of a second parameter including at least a rotational speed of the rotational classifier;
Equipped with
The first command value generation unit generates a command value of the first parameter based at least on a first advance signal determined according to load information of a combustion device that burns the pulverized coal from the coal crushing device. Configured to
The second command value generation unit is configured to obtain a command value of the second parameter based on at least a second advance signal determined according to the load information.

In the present specification, the load information of the combustion apparatus may be information itself related to the load of the combustion apparatus, or a load indirectly indicating the load of the combustion apparatus (for example, generated by a boiler as the combustion apparatus) It may be information related to the load of the steam turbine driven by the stored steam or the load of the generator driven by the steam turbine.

Coal (raw coal) is supplied on the table of a coal pulverizer. As the table rotates, the coal on the table moves toward the outer periphery of the table and is crushed by the rollers. The pulverized coal particles obtained as a result of the grinding in the roller are entrained by the air flow from the air supply and move towards the rotary classifier. In the rotary classifier, classification of pulverized coal particles is performed, and among the pulverized coal particles, only the fine particles pass through the rotary classifier and flow out of the coal pulverizer. As described above, it is necessary to go through various steps from the supply of raw material coal to the removal of coal in the coal pulverizer.
Therefore, there is a time lag (laging delay) before the influence of the change in the feed amount of the raw coal to the coal pulverizer appears as the change in the amount of coal output from the coal pulverizer.
Note that the delayed coal output is due to the response delay in the upstream process from the supply of the raw material coal to the table of the coal crusher to the arrival of the pulverized coal to the inlet of the rotary classifier, and the pulverized coal passing through the rotary classifier. It can be divided into the response delay in the downstream process from the coal pulverizer until the coal is discharged.

In the configuration of the above (1), the first command value generation unit determines the command value of the first parameter based on the first advance signal determined according to the load information of the combustion device.
Thereby, according to the load change of the combustion apparatus, the first parameter including at least one of the rotational speed of the table, the pressing force of the roller, or the air supply amount is changed in advance to supply the raw material coal to the table. It is possible to improve the response delay in the upstream process from the above to the arrival of the pulverized coal to the inlet of the rotary classifier.
On the other hand, the second command value generation unit is configured to determine the command value of the second parameter based on the second advance signal determined according to the load information of the combustion device. Thereby, according to the load change of the combustion device, the second parameter including the rotational speed of the rotary classifier is changed in advance, and the pulverized coal passes through the rotary classifier and is discharged from the coal pulverizer. The response delay in the downstream process can be improved.
In this way, it is possible to improve both the response delay in the upstream process and the response delay in the downstream process, and effectively reduce the coal output delay of the entire coal crushing apparatus.

In addition, if only the rotational speed of the rotary classifier as the second parameter is adjusted by advance control in order to rapidly change the amount of coal output from the coal crushing apparatus, the classification accuracy in the rotary classifier may be reduced. There is.
In this respect, according to the configuration of the above (1), since advance control is performed not only for the second parameter but also for the first parameter, the delay in coal output can be suppressed while suppressing the decrease in classification accuracy in the rotary classifier. It can be improved.

(2) In some embodiments, in the configuration of (1) above,
The first command value generation unit is configured to determine the first advance signal based on a change rate of a command value of the second parameter.

According to the configuration of the above (2), the first control signal is determined based on the rate of change of the command value of the second parameter, so that the viewpoint of achieving both classification accuracy and improvement of delayed coaling Thus, the first control signal can be set appropriately.
For example, when the change rate of the command value of the second parameter (rotational speed of the rotary classifier) that may affect classification accuracy is large, the first advance signal is determined to be a relatively large value based on this. It is possible to achieve both classification accuracy and improvement of delayed coal output.

(3) In some embodiments, in the configuration of (2) above,
The first command value generation unit is configured to set the first advance signal such that a change rate of the first advance signal is equal to or less than a first rate limit determined based on a change rate of the instruction value of the second parameter. Configured to determine

According to the configuration of the above (3), the first rate limit that limits the rate of change of the first preceding signal is variable based on the rate of change of the command value of the second parameter (rotational speed of the rotation classifier). Therefore, it is possible to appropriately determine the first leading signal according to the rate of change of the command value of the second parameter (rotational speed of the rotary classifier) that may affect classification accuracy, and secure classification accuracy and extraction of coal. It can be compatible with the improvement of the delay.

(4) In some embodiments, in any of the configurations of (1) to (3) above,
The second command value generation unit is configured to determine the second advance signal based on a change rate of the command value of the first parameter.

According to the above (4), since the second control signal is determined based on the rate of change of the command value of the first parameter, from the viewpoint of achieving both classification accuracy and improvement of the delay in coal output, The second control signal can be set appropriately.
For example, when the improvement of the delayed coal output by the preliminary control of the first parameter is not sufficient, the improvement effect of the delayed coal output can be sufficiently obtained by determining the second preceding signal based on this.

(5) In some embodiments, in the configuration of (4) above,
The second command value generation unit is configured to set the second lead signal such that a change rate of the second lead signal is equal to or less than a second rate limit determined based on a change rate of the command value of the first parameter. Configured to determine

In the configuration of the above (5), the second rate limit that limits the rate of change of the second preceding signal is variable based on the rate of change of the command value of the first parameter. For this reason, even when the rate of change of the command value of the first parameter is small and the improvement of the coal delay due to the preceding control of the first parameter is not sufficient, the second rate limit can be adjusted appropriately. It is possible to sufficiently suppress the delay in coal output as a whole of the coal crusher by enhancing the effect of delaying the coal delay by the advance control of parameters.

(6) In some embodiments, in any of the configurations of (1) to (5) above,
The combustion device is a boiler for generating steam to be supplied to a steam turbine for driving a generator,
The load information of the combustion apparatus includes at least one of a load, a load change rate, or a load change width of the generator.

According to the configuration of the above (6), the first preceding signal and the second preceding signal are as described in the above (1) based on the load information of the generator load, load change rate, load change width and the like. It is determined. For this reason, by improving both the response delay in the upstream process and the response delay in the downstream process, the coal output delay is effectively improved, and the coal crusher is appropriately adapted to the load change of the generator. Can be controlled. Moreover, since advance control is performed not only for the second parameter but also for the first parameter, it is possible to improve the delay in coal output in the coal pulverizer while suppressing the reduction in classification accuracy in the rotary classifier.

(7) In some embodiments, in the configurations of (1) to (6) above,
The first command value generation unit is configured to obtain the first advance signal according to the load information and raw material coal property information related to the property of the raw material coal.

When the properties of the raw material coal are different, the improvement effect of the delayed coal output to the operation amount of the first parameter is not the same.
In this respect, according to the configuration of the above (7), the first advance signal is set in consideration of not only the load information but also the raw material carbon property information. Therefore, according to the property of the raw material coal, It is possible to perform advance control of parameters and effectively improve the delayed coaling.

(8) In some embodiments, in the configurations of (1) to (7) above,
The second command value generation unit is configured to obtain the second advance signal according to the load information and raw material coal property information related to the property of the raw material coal.

If the properties of the raw material coal are different, the improvement effect of the delayed coal output to the operation amount of the second parameter is not the same.
In this respect, according to the configuration of the above (8), the second advance signal is set in consideration of not only the load information but also the raw material carbon property information. It is possible to perform advance control of parameters and effectively improve the delayed coaling.

(9) In some embodiments, in the configuration of (7) or (8) above,
The raw coal property information includes the moisture content of the raw coal.

According to the findings of the present inventors, the moisture content of the raw material coal can greatly affect the improvement effect of the delayed coal output with respect to the operation amount of each parameter.
In this respect, according to the configuration of the above (9), since the moisture content of the raw material coal is used as the raw material carbon property information, advance control of the first parameter or the second parameter is appropriately performed according to the moisture content of the raw material coal. Can effectively improve the delayed coal output.

(10) A coal crusher according to at least some embodiments of the present invention,
A table configured to be rotatable,
A roller for grinding coal supplied from the table;
An actuator for pressing the roller against the table;
A rotary classifier for classifying pulverized coal obtained by pulverizing the coal in the roller;
An air supply for producing an air flow for directing the pulverized coal towards the rotary classifier;
The control device according to any one of the above (1) to (9), configured to control at least one of the table, the actuator, or the air supply unit, and the rotary classifier.
Equipped with

According to the configuration of the above (10), as described in the above (1), the preceding control of the first parameter in the first command value generating unit and the preceding control of the second parameter in the second command value generating unit Both the response delay in the upstream process and the response delay in the downstream process can be improved. As a result, it is possible to effectively reduce the delayed coal output of the entire coal crushing apparatus.
Furthermore, since advance control is performed not only for the second parameter but also for the first parameter, it is possible to improve the delay in coal output while suppressing a decrease in classification accuracy in the rotary classifier.

(11) A coal-fired thermal power plant according to at least some embodiments of the present invention,
A coal pulverizer of the configuration of the above (10),
A boiler for burning the pulverized coal from the coal crusher to generate steam;
A steam turbine driven by the steam from the boiler;
A generator driven by the steam turbine;
Equipped with

According to the configuration of the above (11), as described in the above (1), the preceding control of the first parameter in the first command value generation unit and the preceding control of the second parameter in the second command value generation unit Both the response delay in the upstream process and the response delay in the downstream process can be improved. As a result, it is possible to effectively reduce the delay in coal output as the whole of the coal crushing apparatus, and to change the load of the coal-fired thermal power plant quickly.
Furthermore, since advance control is performed not only for the second parameter but also for the first parameter, it is possible to improve the delay in coal output while suppressing a decrease in classification accuracy in the rotary classifier.

(12) A control method of a coal crusher according to at least some embodiments of the present invention,
A table configured rotatably, a roller for grinding coal supplied from the table, a rotary classifier for classifying pulverized coal obtained by crushing the coal in the roller, the pulverized coal A control system for a coal comminution device, comprising: an air supply for producing an air flow which directs the rotary classifier to the rotary classifier.
A first command value generation step of generating a command value of a first parameter including at least one of a rotation speed of the table, a pressing force of the roller against the table, or an air supply amount in the air supply unit;
A second command value generation step of generating a command value of a second parameter including at least a rotational speed of the rotational classifier;
Equipped with
In the first command value generation step, the command value of the first parameter is set based on a first advance signal determined according to load information of a combustion device for burning the pulverized coal from the coal crushing device at least. Ask for
In the second command value generation step, a command value of the second parameter is determined based on at least a second advance signal determined according to the load information.

According to the method (12), both the response delay in the upstream process and the response delay in the downstream process can be improved by the advance control of the first parameter and the advance control of the second parameter. As a result, it is possible to effectively reduce the delayed coal output of the entire coal crushing apparatus.
Furthermore, since advance control is performed not only for the second parameter but also for the first parameter, it is possible to improve the delay in coal output while suppressing a decrease in classification accuracy in the rotary classifier.

According to at least one embodiment of the present invention, it is possible to improve the delayed coal output in the coal pulverizer while suppressing the reduction in classification accuracy in the rotary classifier.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the coal-fired thermal-power-generation plant which concerns on one Embodiment. It is a block diagram showing composition of a control device concerning one embodiment. It is a block diagram which shows the structure of the 1st prior | preceding signal calculating part which concerns on one Embodiment. It is a block diagram showing composition of the 2nd precedence signal operation part concerning one embodiment. It is a graph which shows the behavior of various parameters at the time of load change of a coal-fired thermal power plant, (a) shows the change of the amount of coal supply and the amount of coal output of a coal pulverizer, (b) is a command value of the 1st parameter (C) shows the change of the command value of the second parameter, and (d) shows the change of the generator load. It is a flowchart of the control method of the coal crushing apparatus which concerns on one Embodiment.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as the embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, but are merely illustrative. Absent.

FIG. 1 is a schematic configuration diagram of a coal-fired thermal power plant according to an embodiment.

As shown in FIG. 1, a coal-fired thermal power plant 100 according to an embodiment includes a coal crushing apparatus 200, a combustion apparatus (boiler) 300, and a control apparatus 400.

The coal crusher 200 includes a crusher 10 for crushing coal (raw carbon), a rotary classifier 20 for classifying fine particles of pulverized coal obtained by crushing in the crusher 10, and a crusher 10 And an air supply unit 30 for generating an air flow for directing pulverized coal toward the rotary classifier 20.

Note that, in the exemplary embodiment shown in FIG. 1, in the coal crushing apparatus 200, the rotary classifier 20 is disposed above the pulverizer 10, and the vertical crushing is provided with the air supply unit 30 around the pulverizer 10. It is a classification device. In this case, the upper end portion of the crusher housing 11 of the crusher 10 and the lower end portion of the classifier housing 21 of the rotary classifier 20 are connected to integrally form a housing as the entire coal crusher 200.

Further, in some embodiments, as shown in FIG. 1, the coal crushing apparatus 200 includes a supply pipe 50 for supplying coal (raw material coal), and a combustion apparatus described later for pulverized and classified fine particles of coal. And a discharge pipe 51 for emitting coal to the furnace 301 of 300. The supply pipe 50 is provided in the upper part of the coal crushing apparatus 200, and it is comprised so that the raw material coal supplied from the upper direction of the coal crushing apparatus 200 may fall on the below-mentioned table 12 of the grinder 10. In addition, the discharge pipe 51 is provided at the upper portion of the coal crushing apparatus 200, and configured to be capable of discharging the pulverized coal particles having passed through the rotary classifier 20 toward the furnace 301.

As shown in FIG. 1, the crusher 10 of the coal crusher 200 includes a table 12 configured to be rotatable, and a roller 13 configured to crush raw material carbon by being pressed against the table 12. ,including.
The table 12 is driven by a table drive unit 15 located below the table 12 so as to rotate around a central axis C of the table 12. The table drive unit 15 may include a motor whose rotation number is variably controlled in accordance with a table rotation number command from the control device 400.
On the other hand, the roller 13 is configured to roll on the table 12 rotationally driven by the table drive unit 15 while being pressed against the table 12 side by the actuator 16. The actuator 16 may use, for example, a hydraulic cylinder, and the pressing force of the roller 13 against the table 12 may be variably controlled in accordance with a roller pressing force command from the control device 400. A plurality of (for example, three) rollers 13 may be arranged at intervals in the circumferential direction of the table 12 in the outer circumferential area of the table 12.

In the crusher 10 configured as described above, the raw material coal dropped from the supply pipe 50 located above the table 12 to the inner peripheral area of the table 12 moves toward the outer peripheral side of the table 12 by the centrifugal force of the table 12 It is supplied to the gap between the table 12 and the roller 13. The roller 13 is pressed to the side of the table 12 by the actuator 16, so the raw material carbon supplied to the gap between the table 12 and the roller 13 is crushed to obtain pulverized coal.

The air supply unit 30 includes an air suction port 31 provided in the crusher housing 11, an air chamber 33 which is an annular space provided below the table 12 so as to communicate with the air suction port 31, and an air suction port 31. And a fan 34 for supplying air to the air chamber 33, and an air outlet 32 configured such that the air flow from the air chamber 33 blows upward.
The air outlets 32 may be flow paths formed between a plurality of throat vanes circumferentially arranged at intervals on the outer peripheral side of the table 12.
The air supply unit 30 may further include a damper 35 for adjusting the air supply amount from the fan 34. In this case, the damper 35 may be opening-controlled to adjust the air supply amount in the air supply unit 30 in accordance with the air supply amount command from the control device 400.

According to the air supply unit 30 configured as described above, the air taken into the air chamber 33 from the air outlet 32 is blown upward through the air outlet 32. As a result, the inside of the housing (11, 21) of the coal crushing apparatus 200 An upward air flow (see arrow a in FIG. 1) is formed at.
At this time, the large-size particles deviate from the air flow a under the influence of gravity, fall downward, return to the table 12, and are crushed again.

The rotary classifier 20 is provided above the crusher 10 and is configured to classify pulverized coal particles to be accompanied by the air flow a formed by the air supply unit 30.
In some embodiments, as shown in FIG. 1, the rotary classifier 20 includes an annular rotating portion 22 for classifying pulverized coal particles. The annular rotation portion 22 is rotatably provided around the rotation axis O along the up and down direction in the internal space of the classifier housing 21. The annular rotary portion 22 includes a plurality of rotary fins arranged in the circumferential direction at intervals from each other, and fine particles of pulverized coal can pass through the gap between the adjacent rotary fins.

The classification principle of pulverized coal in the annular rotation portion 22 is as follows.
The pulverized coal accompanied by the air flow a and directed to the rotary classifier 20 is imparted with swirl by the rotation of the annular rotating portion 22. As a result, in the pulverized coal particles accompanied by the air flow, the centrifugal force directed radially outward due to the centrifugal field formed by the annular rotating portion 22 and the drag due to the velocity component of the air flow directed radially inward Works. The particle diameter at which the centrifugal force and the drag balance is the theoretical classification diameter. The coarse particles having a particle diameter larger than the theoretical classification diameter have a centrifugal force larger than the drag force caused by the velocity component of the air flow, and are splashed to the outer peripheral side of the annular rotation portion 22. On the other hand, fine particles having a particle diameter smaller than the theoretical classification diameter are entrained by the air flow and pass through the annular rotation portion 22 because the resistance received from the air flow is larger than the centrifugal force. Thus, in the annular rotation portion 22, the pulverized coal particles transported by the air flow are classified into coarse particles and fine particles.

In some embodiments, the rotational classifier 20 includes a classifier drive 24 for rotating the annular rotation portion 22 about the rotation axis O.
The classifier drive unit 24 may include a motor whose rotation number is variably controlled in accordance with a classifier rotation number command from the control device 400.

The rotary classifier 20 may be provided with an annular stationary portion 23 provided on the outer peripheral side of the annular rotary portion 22 inside the classifier housing 21 as shown in FIG. 1. The annular stationary portion 23 has a plurality of fixed fins arranged at intervals in the height direction, and the air flow a can pass through the gap between the adjacent fixed fins. The annular stationary portion 23 is configured to rectify the air flow a flowing in from the outer peripheral side.
Furthermore, as shown in FIG. 1, the rotary classifier 20 is located below the annular rotation portion 22 and the hopper 25 for returning coarse particles not passing through the annular rotation portion 22 to the table 12 of the crusher 10 is You may provide further.

Pulverized coal produced in the coal crushing apparatus 200 configured as described above is supplied to the combustion apparatus 300.
The combustion apparatus (boiler) 300 includes a furnace 301 which burns fine particles of coal discharged from the coal crushing apparatus 200 by the burner 302 to generate a combustion gas. A heat exchanger 303 is installed in the furnace 301. In the heat exchanger 303, steam is generated by heat exchange with the combustion gas in the furnace 301.

The steam generated in the combustion device (boiler) 300 is supplied to the steam turbine 310 of the coal-fired power plant 100. The steam turbine 310 is driven by steam supplied from a combustion device (boiler) 300. The shaft of the generator 320 is connected to the rotating shaft of the steam turbine 310, and the generator 320 is driven by the steam turbine 310 to generate electric power.
Also, the steam that has flowed out of the steam turbine 310 is condensed in the condenser 330. Then, the condensed water (condensed water) obtained by the condenser 330 is supplied again to the heat exchanger 303 by the feed water pump 340.

In the coal-fired thermal power plant 100 configured as described above, the control device 400 controls each part of the coal crushing apparatus 200 such as the table drive unit 15, the actuator 16, the damper 35, and the classifier drive unit 24.
In addition, the coal crushing apparatus 200 is equipped with several measuring devices for knowing the state of the coal crushing apparatus 200. For example, the inlet air flow meter 111, the inlet air thermometer 112, the outlet air thermometer 113, the coal feeding At least one of the meter 114, the coal feeding thermometer 115, the furnace differential pressure gauge 116, and the outlet pressure gauge 117 may be provided. Furthermore, a power meter (not shown) for measuring the output of the generator 320 is provided, and load information (for example, load change width, load change rate, load) of the combustion apparatus 300 (coal-fired thermal power plant 100) Etc.) may be obtained.
In this case, the measurement results of these various instruments may be sent to the control device 400 and used to control each part of the coal crushing device 200 by the control device 400.

The details of the control device 400 will be described below with reference to FIGS. 2 to 4.
FIG. 2 is a block diagram showing a configuration of a control device according to an embodiment. FIG. 3 is a block diagram showing a configuration of first preceding signal calculation unit 520A of control device 400. Referring to FIG. FIG. 4 is a block diagram showing the configuration of the second advance signal operation unit 620 of the control device 400.

In some embodiments, the controller 400 sets the command value of the first parameter including at least one of the rotational speed of the table 12, the pressing force of the roller 13 against the table 12, or the air supply amount at the air supply unit 30. And a second command value generating unit 600 for generating a command value of a second parameter including at least the rotational speed of the rotation classifier 20.
In the exemplary embodiment shown in FIG. 2, the first command value generation unit 500 has three types of rotation speed of the table 12, pressing force of the roller 13 against the table 12, and air supply amount in the air supply unit 30. A command value is generated for each of the first parameters. In another embodiment, the first command value generation unit 500 is configured to generate a command value for only a part of these three types of first parameters.

In some embodiments, as shown in FIG. 2, the first command value generation unit 500 generates the basic command value of the first parameter according to the coal feed amount command (coal feed amount command) to the coal crushing apparatus 200. And a first advance signal calculation unit 520 (520A to 520C) for calculating a first advance signal determined according to the load information of the combustion apparatus 300. And). Here, the basic command value calculation unit 510 (510A to 510C) may include a function such that the basic command value of the first parameter increases as the coal feeding amount command increases. The coal feed amount command may be determined according to the load of the combustion device 300 (= load of the generator 320).
In the exemplary embodiment shown in FIG. 2, in the adder 530 (530A to 530C), the basic command value of the first parameter obtained by the basic command value calculation unit 510 (510A to 510C), and the first advance signal. The sum of the first preceding signals obtained by the operation unit 520 (520A to 520C) is calculated, and the command value of the first parameter is generated based on the output signal from the adder 530.

In addition, as shown in FIG. 2, the output signal from the adder 530 (530A) is subjected to limit processing by the first limit (upper limit) 540 and the second limit (lower limit) 550 to obtain the first parameter. The command value may be limited within a desired range.
In this case, the first limit 540 is the first parameter of the first parameter based on the output signal from the function 542 configured to variably set the upper limit value of the command value of the first parameter according to the moisture content of the raw material coal. The command value may be limited to the upper limit value or less. The moisture content of the raw material coal may be calculated by estimation based on the measurement results of the various instruments (111 to 117) described above.
Similarly, based on an output signal from a function 552 configured to variably set the lower limit value of the command value of the first parameter according to the mill differential pressure (the differential pressure between the coal crusher 200 and the differential pressure), The two limits 550 may limit the command value of the first parameter to the upper limit value or less.
In the example shown in FIG. 2, the limit process by the first limit 540 and the second limit 550 is performed only for the table rotational speed command, but in the other embodiments, the other first parameter (air supply quantity command or The limit processing by the first limit 540 and the second limit 550 is also performed for the roller pressing force command.

Further, as shown in FIG. 2, a limit 560 for limiting the command value of the first parameter may be provided within a range defined by a certain upper limit value and a certain lower limit value. The limit 560 is configured to limit the command value of the first parameter within a prescribed range by performing limit processing on the output signal from the adder 530 (530B, 530B).
In the exemplary embodiment shown in FIG. 2, the limit processing by the limit 560 is applied only to the air supply amount command and the roller pressing force command, but in the other embodiments, the table rotational speed command is also applied. Instead of the one limit 540 and the second limit 550, limit processing by the limit 560 is performed.

Further, as shown in FIG. 2, the control device 400 is a change rate calculator 580 (580A ̃) for obtaining the change rate (change rate) of the command value of the first parameter generated by the first command value generation unit 500. 580C) may be provided. The change rate of the command value of the first parameter determined by the change rate calculator 580 may be used, for example, to calculate a second advance signal in a second advance signal operation unit 620 described later (a function 880 in FIG. 4). 882, 884 (see input signal).

As shown in FIG. 3, the first advance signal computing unit 520 (520A) of the first command value generating unit 500 performs the first advance signal calculation unit 520 according to the load information of the combustion apparatus 300 (or the coal fired thermal power plant 100 including the same). 1 Configured to determine a prior signal.
Although FIG. 3 shows the configuration of the first advance signal calculation unit 520A for obtaining the first advance signal to be used for calculation of the command value of the table rotational speed, which is an example of the first parameter, The first preceding signal (520B, 520C) having the same configuration as the first preceding signal operation unit 520A shown in FIG. It may be calculated.

Specifically, the first advance signal calculation unit 520 (520A) calculates a first reference advance signal calculation unit for obtaining a reference value (first reference advance signal) of the first advance signal according to the coal feed amount command value. 700 and an operation coefficient calculation unit 710 (710A) for obtaining an operation coefficient (correction coefficient) to be multiplied by the first reference advance signal according to load information of the combustion apparatus 300 (coal-fired thermal power plant 100) To 710 C).
The first reference advance signal calculated by the first reference advance signal calculation unit 700 and the operation coefficient calculated by the operation coefficient calculation unit 710 (710A to 710C) are input to the multiplier 750 and multiplied with each other to perform multiplication. The first preceding signal is determined based on the product obtained by the unit 750.

The first reference advance signal calculation unit 700 may include a function such that the first reference advance signal increases with an increase in the coal feeding amount command.
On the other hand, the load information considered when the calculation coefficient calculation unit 710 (710A to 710C) calculates the calculation coefficient is at least one of the load of the combustion apparatus 300, the load change rate, or the load change width It is also good. In this case, the calculation coefficient calculation unit 710 (710A to 710C) may include a function such that the calculation coefficient increases with an increase in load information such as the load of the combustion apparatus 300, the load change rate, and the load change width.

In some embodiments, as shown in FIG. 3, the first advance signal computing unit 520 (520A) takes into consideration not only load information but also raw coal property information related to the properties of the raw coal, the first advance signal. It is configured to ask for
In the exemplary embodiment shown in FIG. 3, the first advance signal calculation unit 520 (520A) is a calculation coefficient calculation unit for calculating a calculation coefficient according to the moisture content of the raw material carbon, which is an example of the raw material carbon property information. 740 is further provided, and the operation coefficient obtained by the operation coefficient calculation unit 740 is input to the multiplier 750. Thus, the first advance signal is set in consideration of not only the load information but also the raw material coal property information, so that the first parameter advance control can be appropriately performed according to the property of the raw material coal. Delay can be effectively improved.

Also, in some embodiments, as shown in FIG. 3, the first preceding signal computing unit 520 (520A) determines the first preceding signal based on the rate of change of the command value of the second parameter. Configured
In the exemplary embodiment illustrated in FIG. 3, the first preceding signal calculation unit 520 (520A) determines a threshold (based on the change rate of the command value of the second parameter (= classifier rotational speed command change rate)) Below the first rate limit, the rate limit (760, 770) for limiting the rate of change of the first preceding signal is included. Here, the rate limit 760 is for limiting the positive change rate (= increase rate) of the first preceding signal to a threshold or less. On the other hand, the rate limit 770 is for limiting the negative change rate (= reduction rate) of the first preceding signal to a threshold or less.
Thus, in rate limit (760, 770), the rate of change of the first preceding signal is limited to a threshold value or less that is variable according to the rate of change of the command value of the second parameter (= rate of change of classifier speed command). Do. Therefore, it is possible to appropriately determine the first advance signal according to the rate of change of the command value of the second parameter (rotational speed of the rotary classifier 20) that may affect classification accuracy, and secure classification accuracy and extraction of coal. It can be compatible with the improvement of the delay.

In the example shown in FIG. 3, the first advance signal computing unit 520 (520A) outputs a value corresponding to the change rate of the command value of the second parameter (= classifier rotational speed command change rate) and The change rate (in the case of the example of FIG. 3) of the first parameter other than the first parameter (table rotation speed in the case of the example of FIG. 3) related to the calculation target in the first advance signal calculation unit 520 (520A) A function (782, 784) is provided which outputs values according to the supply amount command change rate and the roller pressing force command change rate). Adder 786 sums the outputs from each function (780, 782, 784). The calculation result of the adder 786 is multiplied by the gains K ₁ and K ₂ to obtain threshold values used for limit processing at each rate limit (760, 770).

Referring back to FIG. 2, the second command value generation unit 600 will be described.
In some embodiments, as shown in FIG. 2, the second command value generation unit 600 includes a basic command value calculation unit 610 for calculating a basic command value of the second parameter according to the coal feed amount command, And a second preceding signal calculation unit 620 for calculating a second preceding signal determined according to the load information of the combustion apparatus 300. Here, the basic command value calculation unit 610 may include a function such that the basic command value of the second parameter increases with the increase of the coal feeding amount command.
In the exemplary embodiment shown in FIG. 2, in the adder 630, the basic command value of the second parameter obtained by the basic command value calculation unit 610, and the second advance obtained by the second advance signal operation unit 620. The sum of the signals is calculated, and the command value of the second parameter is generated based on the output signal from the adder 630.

Further, in the exemplary embodiment shown in FIG. 2, a limit 640 for limiting the command value of the second parameter may be provided within a range defined by a certain upper limit value and a certain lower limit value. The limit 640 is configured to limit the command value of the second parameter within a prescribed range by subjecting the output signal from the adder 630 to a limit process.
In another embodiment, the output signal from the adder 630 is replaced with the limit 640, and a limit similar to the first limit (upper limit) 540 and the second limit (lower limit) 550 as shown in FIG. By performing processing, the command value of the second parameter may be limited within a desired range. In this case, the first limit 540 is the second parameter of the second parameter based on the output signal from the function 542 configured to variably set the upper limit value of the command value of the second parameter according to the moisture content of the raw material coal. The command value may be limited to the upper limit value or less. Similarly, based on an output signal from a function 552 configured to variably set the lower limit value of the command value of the second parameter according to the mill differential pressure (the differential pressure between the coal crusher 200 and the differential pressure), The two limits 550 may limit the command value of the second parameter to the upper limit value or less.

Furthermore, as shown in FIG. 2, the control device 400 is provided with a change rate calculator 680 for obtaining the change rate (change rate) of the command value of the second parameter generated by the second command value generation unit 600. May be
The change rate of the command value of the second parameter determined by the change rate calculator 680 may be used, for example, to calculate the first preceding signal in the first preceding signal calculating unit 520 described above (see function 780 in FIG. 3). Input signal)).

As shown in FIG. 4, the second advance signal calculation unit 620 of the second command value generation unit 600 generates a second advance signal according to the load information of the combustion apparatus 300 (or the coal-fired thermal power plant 100 including the same). Configured to determine
Specifically, the second advance signal calculation unit 620 calculates a second reference advance signal calculation unit 800 for obtaining a reference value (second reference advance signal) of the second advance signal according to the coal feeding amount command value, Calculation coefficient calculation unit 810 (810A to 810C) for obtaining a calculation coefficient (correction coefficient) to be multiplied by the second reference advance signal according to the load information of the combustion apparatus 300 (coal fired thermal power plant 100) And may be included.
The second reference advance signal calculated by the second reference advance signal calculation unit 800 and the operation coefficient calculated by the operation coefficient calculation unit 810 (810A to 810C) are input to the multiplier 850 and multiplied with each other to perform multiplication. The second preceding signal is determined based on the product obtained by the unit 850.

The second reference advance signal calculation unit 800 may include a function such that the second reference advance signal increases with an increase in the coal feeding amount command.
On the other hand, the load information considered when the calculation coefficient calculation unit 810 (810A to 810C) calculates the calculation coefficient is at least one of the load of the combustion apparatus 300, the load change rate, or the load change width It is also good. In this case, when the load information is the load change rate of the combustion device 300, the calculation coefficient calculation unit 810A may include a function such that the calculation coefficient decreases as the load change rate of the combustion device 300 increases. On the other hand, when the load information is the load change width or load of the combustion device 300, the calculation coefficient calculation unit 810 (810B, 810C) is a function that increases the calculation coefficient as the load change rate of the combustion device 300 increases. May be included.

In some embodiments, as shown in FIG. 4, the second advance signal computing unit 620 obtains the second advance signal in consideration of not only the load information but also the raw material coal property information related to the property of the raw material coal. Configured
In the exemplary embodiment shown in FIG. 4, the second advance signal calculation unit 620 further calculates a calculation coefficient calculation unit 840 for calculating a calculation coefficient according to the moisture content of the raw material coal which is an example of the raw material coal property information. The operation coefficient calculated by the operation coefficient calculation unit 840 is input to the multiplier 850. As a result, the second advance signal is set in consideration of not only the load information but also the raw material coal property information, so that the second parameter advance control can be appropriately performed according to the property of the raw material coal. Delay can be effectively improved.

Also, in some embodiments, as shown in FIG. 4, the second lead signal computing unit 620 is configured to determine the second lead signal based on the rate of change of the command value of the first parameter. .
In the exemplary embodiment illustrated in FIG. 4, the second advance signal calculation unit 620 changes the change rate of the command value of the first parameter (= table rotational speed command change rate, roller pressing force command change rate, air supply amount command change). The rate limit (860, 870) for limiting the rate of change of the second preceding signal is included below the threshold (= second rate limit) determined based on the rate). Here, the rate limit 860 is for limiting the positive change rate (= increase rate) of the second preceding signal to a threshold or less. On the other hand, the rate limit 870 is for limiting the negative change rate (= reduction rate) of the second preceding signal to a threshold or less.
As described above, the rate limit (860, 870) is variable according to the change rate of the command value of the first parameter (= table rotational speed command change rate, roller pressing force command change rate, air supply amount command change rate). The rate of change of the second preceding signal is limited to a certain threshold or less. For this reason, even when the rate of change of the command value of the first parameter is small and the improvement of the coal delay due to the preceding control of the first parameter is not sufficient, the second rate limit can be adjusted appropriately. It is possible to sufficiently suppress the delayed coaling of the coal crusher 200 as a whole by enhancing the effect of improving the delayed coaling by the advance control of the parameters.

In the example shown in FIG. 4, the second advance signal calculation unit 620 is configured to calculate the change rate of the command value of the first parameter (= table rotational speed command change rate, roller pressing force command change rate, air supply amount command change rate). The function (880, 882, 884) which outputs the value according to is provided. The adder 886 sums the outputs from the functions (880, 882, 884). The calculation result of the adder 886 is multiplied by the gains K ₁ and K ₂ to obtain a threshold used for limit processing at each rate limit (860, 870).

According to some embodiments described above, the first advance signal calculation unit 520 (520A to 520C) of the first command value generation unit 500 determines the first advance signal according to the load information of the combustion apparatus 300. The command value of the first parameter is determined based on the first advance signal. Thereby, according to the load change of the combustion apparatus 300, the first parameter including at least one of the rotational speed of the table 12, the pressing force of the roller 13, or the air supply amount in the air supply unit 30 is changed in advance. The response delay in the upstream process from the supply of the raw material coal to the table 12 to the arrival of the pulverized coal to the inlet of the rotary classifier 20 can be improved.
On the other hand, the second advance signal computing unit 620 of the second command value generation unit 600 determines the command value of the second parameter based on the second advance signal determined according to the load information of the combustion apparatus 300. ing. Thereby, according to the load change of the combustion apparatus 300, the second parameter including the rotational speed of the rotary classifier 20 is changed in advance, and the pulverized coal passes through the rotary classifier 20 and the coal pulverizer 200 is discharged. It is possible to improve the response delay in the downstream process until it is done.
In this way, it is possible to improve both the response delay in the upstream process and the response delay in the downstream process, and effectively reduce the coal output delay of the coal crushing apparatus 200 as a whole.

In addition, if only the rotational speed of the rotary classifier 20 as the second parameter is adjusted by advance control in order to rapidly change the amount of coal output from the coal crushing apparatus 200, the classification accuracy in the rotary classifier 20 decreases. There is a possibility of
In this respect, according to the above-described embodiment, since advance control is performed not only for the second parameter but also for the first parameter, the delay in coal output is improved while suppressing the reduction in classification accuracy in the rotary classifier 20. can do.

FIG. 5 is a graph showing the behavior of various parameters at the time of load change of the coal-fired thermal power plant 100, and FIG. 5 (a) shows changes in the amount of coal supply and amount of coal output of the coal crushing apparatus 200, (B) shows the change of the command value of the first parameter, FIG. 5 (c) shows the change of the command value of the second parameter, and FIG. 5 (d) shows the change of the load of the generator 320.
With respect to each of FIGS. 5 (a) to 5 (d), changes over time of various parameters when the preceding control is not performed by the first preceding signal and the second preceding signal are shown on the left side. (2) The time-dependent change of various parameters in the case of performing the advance control by the advance signal is shown at the center, and the time-dependent change of various parameters when the load change width is large is shown on the right.

As shown in FIGS. 5 (b) and 5 (c), when the preceding control by the first preceding signal and the second preceding signal is not performed, the command values of the first parameter and the second parameter are respectively shown in FIG. It is the basic command value (900, 950) itself calculated according to the coal feeding amount command in the basic command value calculation unit (510, 610) shown.
Therefore, as shown in FIG. 5A, even if the amount of coal feeding to the coal crushing apparatus 200 is increased according to the increase of the load command value of the generator 320, the amount of coal output from the coal crushing apparatus 200 is moderate. It only increases. This corresponds to the increase in the amount of coal supply, the command value of the first parameter (= table rotation speed command, roller pressing force command, air supply amount command) and the command value of the second parameter (= classifier rotation speed command) The reason is that the amount of coal output from the coal crusher 200 does not immediately follow because of the delay in coal output, even if. Then, as a result of the response delay occurring in the amount of coal output from the coal crushing apparatus 200, as shown in FIG. 5D, the load of the generator 320 also causes a response delay with respect to the load command value.

On the other hand, as described in the above-mentioned embodiment, when performing the preceding control by the first preceding signal and the second preceding signal, the first preceding signal and the second preceding signal determined according to the load information are basic instructions By being added to the values (900, 950), the command value 910 of the first parameter and the command value 960 of the second parameter are generated.
For this reason, as shown in FIG. 5A, when the amount of coal feeding to the coal crushing apparatus 200 is increased according to the increase of the load command value of the generator 320, the response delay of the amount of coal output from the coal crushing apparatus 200 The delay in coal output is reduced. And as a result of the response delay being reduced to the amount of coal output from the coal crushing apparatus 200, as shown in FIG. 5 (d), the response delay to the load command value of the load of the generator 320 is also reduced.

Similarly, even when the load change width is large, when performing lead control with the first lead signal and the second lead signal, the first lead signal and the second lead signal determined according to the load information have basic command values By being added to 930 and 970), the command value 940 of the first parameter and the command value 980 of the second parameter are generated.
For this reason, as shown in FIG. 5A, when the amount of coal feeding to the coal crushing apparatus 200 is increased according to the increase of the load command value of the generator 320, the response delay of the amount of coal output from the coal crushing apparatus 200 The delay in coal output is reduced. And as a result of the response delay being reduced to the amount of coal output from the coal crushing apparatus 200, as shown in FIG. 5 (d), the response delay to the load command value of the load of the generator 320 is also reduced.

Then, with reference to FIG. 6, the control method of the coal crushing apparatus 200 which concerns on some embodiment is demonstrated. FIG. 6 is a flowchart of a control method of the coal crushing apparatus 200 according to an embodiment.

As shown in FIG. 6, first, load information of the combustion apparatus 300 (coal-fired thermal power plant 100) is acquired (step S10). The load information may be at least one of load of the combustion apparatus 300, load change rate, or load change width.

Then, in accordance with the load information of the combustion apparatus 300 acquired in step S10, a first advance signal used for calculation of the command value of the first parameter is calculated (step S12). Here, as described above, the first parameter includes at least one of the rotational speed of the table 12, the pressing force of the roller 13 against the table 12, and the air supply amount in the air supply unit 30.
The calculation of the first advance signal may be performed using the first advance signal operation unit 520 shown in FIG. In this case, the first reference advance signal calculation unit 700 determines the reference value (first reference advance signal) of the first advance signal according to the coal feed amount command value, and the operation coefficient calculation unit 710 (710A to 710C). Determining a calculation coefficient (correction coefficient) determined according to load information of the combustion apparatus 300 (coal-fired thermal power plant 100), and determining a first advance signal based on a product of the first reference advance signal and the calculation coefficient May be Under the present circumstances, in addition to the load information of the combustion apparatus 300, the 1st prior signal may be calculated | required in consideration of the raw material coal property information regarding the property of raw material coal. Specifically, the calculation coefficient calculation unit 740 calculates a calculation coefficient according to the moisture content of the raw material coal which is an example of the raw material coal property information, and the first reference advance signal and the calculation coefficient calculation unit 710 (710A to 710C) The first preceding signal may be determined based on the product of the operation coefficient obtained in the above and the operation coefficient obtained by the operation coefficient calculation unit 740. Furthermore, when determining the first preceding signal in the first preceding signal calculation unit 520, the change rate of the command value of the second parameter may be taken into consideration. Specifically, the rate limit (760, 770) is used to set the first parameter limit below the threshold (= first rate limit) determined based on the rate of change of the command value of the second parameter (= rate of change of classifier speed command). The rate of change of the preceding signal may be limited.

Subsequently, the command value of the first parameter is generated based on the first advance signal obtained in step S12 (step S14).
Specifically, the basic command value calculation unit 510 (510A to 510C) calculates the basic command value of the first parameter according to the coal feed amount command (the coal feed amount command) to the coal crushing apparatus 200, The command value of the first parameter is calculated by adding the first advance signal obtained in step S12 to the basic command value.

Further, in accordance with the load information of the combustion device 300 acquired in step S10, a second advance signal used for calculation of the command value of the second parameter is calculated (step S16). Here, the second parameter includes the rotational speed of the rotary classifier 20 as described above.
The calculation of the second advance signal may be performed using the second advance signal operation unit 620 shown in FIG. In this case, the second reference advance signal calculation unit 800 determines the reference value (second reference advance signal) of the second advance signal according to the coal feed amount command value, and the calculation coefficient calculation unit 810 (810A to 810C) Determining a calculation coefficient (correction coefficient) determined according to load information of the combustion apparatus 300 (coal-fired thermal power plant 100), and determining a second advance signal based on a product of the second reference advance signal and the calculation coefficient May be Under the present circumstances, in addition to the load information of the combustion apparatus 300, the 2nd prior signal may be calculated | required in consideration of the raw material coal property information regarding the property of raw material coal. Specifically, the calculation coefficient calculation unit 840 calculates a calculation coefficient according to the moisture content of the raw material coal which is an example of the raw material coal property information, and the second reference advance signal and the calculation coefficient calculation unit 810 (810A to 810C) The second preceding signal may be determined based on the product of the operation coefficient obtained in the above and the operation coefficient obtained by the operation coefficient calculation unit 840. Furthermore, when determining the second advance signal in the second advance signal operation unit 620, the change rate of the command value of the first parameter may be taken into consideration. Specifically, the rate limit (860, 870) is determined based on the change rate of the command value of the first parameter (= table rotational speed command change rate, roller pressing force command change rate, air supply amount command change rate). The rate of change of the second preceding signal may be limited to a threshold (= second rate limit) to be calculated.

Subsequently, the command value of the second parameter is generated based on the second advance signal obtained in step S16 (step S18).
Specifically, the basic command value calculation unit 610 calculates the basic command value of the second parameter according to the coal feed amount command (coal feed amount command) to the coal crushing apparatus 200, and the basic command value is calculated for the basic command value. The command value of the second parameter is calculated by adding the second advance signal obtained in step S16.

And each part of the coal crushing apparatus 200 is controlled based on the command value of the 1st parameter obtained by step S14, and the command value of the 2nd parameter obtained by step S18 (step S20).
Specifically, in accordance with the command value of the first parameter, at least one of the table drive unit 15, the actuator 16, and the damper 35 of the coal crushing apparatus 200 is controlled. Similarly, the classifier drive unit 24 of the coal crushing apparatus 200 is controlled according to the command value of the second parameter.

According to the method shown in FIG. 6, both the response delay in the upstream process and the response delay in the downstream process can be improved by the advance control of the first parameter and the advance control of the second parameter. As a result, it is possible to effectively reduce the delayed coal output of the coal crushing apparatus 200 as a whole.
Furthermore, since advance control is performed not only for the second parameter but also for the first parameter, it is possible to improve the delay in coal output while suppressing the reduction in classification accuracy in the rotary classifier 20.

As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, The form which added deformation | transformation to embodiment mentioned above, and the form which combined these forms suitably are also included.

DESCRIPTION OF SYMBOLS 10 Crusher 11 Crusher housing 12 Table 13 Roller 15 Table drive part 16 Actuator 20 Rotation classifier 21 Classifier housing 22 Annular rotation part 23 Annular stationary part 24 Classifier drive part 25 Hopper 30 Air supply part 31 Air suction port 32 Air Air outlet 33 Air chamber 34 Fan 35 Damper 50 Supply pipe 51 Exhaust pipe 100 Coal-fired thermal power plant 111 Inlet air flow meter 112 Inlet air temperature meter 113 Outlet air temperature meter 114 Coal feed amount meter 115 Coal feed temperature gauge 116 Fire furnace differential pressure gauge 117 outlet pressure gauge 200 coal crushing apparatus 300 combustion apparatus 301 furnace 302 burner 303 heat exchanger 310 steam turbine 320 generator 330 condenser 340 water supply pump 400 control apparatus 500 first command value generation unit 510 basic command value calculation unit 520 1 Advance signal operation unit 600 second Command value generation unit 610 Basic command value calculation unit 620 Second advance signal calculation unit 700 First reference advance signal calculation unit 710 (710A to 710C) Calculation coefficient calculation unit 800 Second reference advance signal calculation unit 810 (810A to 810C) Operation Coefficient calculation unit

Claims (12)

1. A table configured rotatably, a roller for grinding coal supplied from the table, a rotary classifier for classifying pulverized coal obtained by crushing the coal in the roller, the pulverized coal A control device for a coal comminution device, comprising: an air supply unit for generating an air flow for directing the rotary classifier to the rotary classifier.
   A first command value generation unit for generating a command value of a first parameter including at least one of a rotation speed of the table, a pressing force of the roller against the table, or an air supply amount in the air supply unit; ,
   A second command value generation unit for generating a command value of a second parameter including at least a rotational speed of the rotational classifier;
   Equipped with
   The first command value generation unit generates a command value of the first parameter based at least on a first advance signal determined according to load information of a combustion device that burns the pulverized coal from the coal crushing device. Configured to
   In the coal crushing apparatus, the second command value generation unit is configured to obtain a command value of the second parameter based on at least a second advance signal determined according to the load information. Control device.
2. The coal shredding device according to claim 1, wherein the first command value generation unit is configured to determine the first advance signal based on a change rate of the command value of the second parameter. Control device.
3. The first command value generation unit is configured to set the first advance signal such that a change rate of the first advance signal is equal to or less than a first rate limit determined based on a change rate of the instruction value of the second parameter. The control device of a coal crushing apparatus according to claim 2, wherein the control device is configured to determine.
4. 4. The apparatus according to any one of claims 1 to 3, wherein the second command value generation unit is configured to determine the second advance signal based on a change rate of a command value of the first parameter. The control apparatus of the coal crushing apparatus as described in a term.
5. The second command value generation unit is configured to set the second lead signal such that a change rate of the second lead signal is equal to or less than a second rate limit determined based on a change rate of the command value of the first parameter. 5. A control system according to claim 4, characterized in that it is configured to determine.
6. The combustion device is a boiler for generating steam to be supplied to a steam turbine for driving a generator,
   The coal crushing apparatus according to any one of claims 1 to 5, wherein the load information of the combustion apparatus includes at least one of a load, a load change rate, or a load change range of the generator. Control device.
7. The first command value generation unit is configured to obtain the first advance signal according to the load information and raw material coal property information related to the property of raw material coal. The control apparatus of the coal crushing apparatus as described in any one.
8. The second command value generation unit is configured to obtain the second advance signal according to the load information and raw material coal property information related to the property of the raw material coal. The control apparatus of the coal crushing apparatus as described in any one.
9. The control device of a coal crushing apparatus according to claim 7 or 8, wherein the raw material coal property information includes a moisture content of the raw material coal.
10. A table configured to be rotatable,
    A roller for grinding coal supplied from the table;
    An actuator for pressing the roller against the table;
    A rotary classifier for classifying pulverized coal obtained by pulverizing the coal in the roller;
    An air supply for producing an air flow for directing the pulverized coal towards the rotary classifier;
    The control device according to any one of claims 1 to 9, configured to control the table, at least one of the actuator or the air supply unit, and the rotation classifier.
    A coal crusher characterized by comprising:
11. The coal crushing apparatus according to claim 10,
    A boiler for burning the pulverized coal from the coal crusher to generate steam;
    A steam turbine driven by the steam from the boiler;
    A generator driven by the steam turbine;
    Coal-fired thermal power plant characterized by having.
12. A table configured rotatably, a roller for grinding coal supplied from the table, a rotary classifier for classifying pulverized coal obtained by crushing the coal in the roller, the pulverized coal A control system for a coal comminution device, comprising: an air supply for producing an air flow which directs the rotary classifier to the rotary classifier.
    A first command value generation step of generating a command value of a first parameter including at least one of a rotation speed of the table, a pressing force of the roller against the table, or an air supply amount in the air supply unit;
    A second command value generation step of generating a command value of a second parameter including at least a rotational speed of the rotational classifier;
    Equipped with
    In the first command value generation step, the command value of the first parameter is set based on a first advance signal determined according to load information of a combustion device for burning the pulverized coal from the coal crushing device at least. Ask for
    A control method of a coal crushing apparatus, wherein in the second command value generation step, a command value of the second parameter is obtained based on at least a second advance signal determined according to the load information.

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